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POSample texturing using Texture atlas and openGL 1.1 in android
 

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  1. POSample texturing using Texture atlas and openGL 1.1 in android
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    <p>I'm having a problem with texturing objects in OpenGL using texture atlases, I'm creating a 2d game and I know how to texture a POT bitmap to an object but, I can't seem to find a tutorial in converting my code to use a texture atlas for performance reasons, here is my code for my current working object creation and texturing implementation.</p> <pre><code>public void createTexture(Bitmap bmp, GL10 gls, int texturename) { this.gl = (GL11) gls; this.TextureName = texturename; bombBmp = bmp; VertexBuffer = null; TextureBuffer = null; IndexBuffer = null; ByteBuffer byteBuffer = ByteBuffer.allocateDirect(12 * 4); byteBuffer.order(ByteOrder.nativeOrder()); VertexBuffer = byteBuffer.asFloatBuffer(); VertexBuffer.put(new float[] { 0, 0, 0.0f, 0, -h, 0.0f, w, 0, 0.0f, w, -h, 0.0f }); VertexBuffer.position(0); byteBuffer = ByteBuffer.allocateDirect(8 * 4); byteBuffer.order(ByteOrder.nativeOrder()); TextureBuffer = byteBuffer.asFloatBuffer(); TextureBuffer.put(new float[] { 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f }); TextureBuffer.position(0); byteBuffer = ByteBuffer.allocateDirect(6 * 2); byteBuffer.order(ByteOrder.nativeOrder()); IndexBuffer = byteBuffer.asShortBuffer(); IndexBuffer.put(new short[] { 0, 1, 2, 1, 3, 2 }); IndexBuffer.position(0); gl.glBindTexture(GL10.GL_TEXTURE_2D, this.TextureName); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE); GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bombBmp, 0); bombBmp.recycle(); bombBmp = null; } </code></pre> <p>I generate my Texturename from genTexture and pass the POT bitmap to this function</p> <pre><code>gl.glGenTextures(1, textures, 0); bomb.createTexture(bombBmp, gl, textures[0]); </code></pre> <p>here's my supposed texture bitmap</p> <p><img src="https://i.stack.imgur.com/uxEVI.png" alt="bomb_atlas.png"></p>
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    1. COWhat specifically about texture atlases don't you understand? Do you know how texture coordinates work? I don't think anyone is going to rewrite your code for you, though if there's some specific concept you don't understand you might find some help.
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    2. COI don't know how to bind a sub image from a texture atlas, I only know how to bind an image as a whole, like, do I have to use texImage2d first then texSubImage? or do I have to use the texSubImage immediately? thanks
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